Doctors' protective costume used during an outbreak of pneumonic plague, Manchuria, 1910-1911. Pneumonic plague, a severe type of lung infection, is one of three main forms of plague, all of which are caused by the bacterium Yersinia pestis. It is more virulent and rare than bubonic plague. The difference between the versions of plague is simply the location of the infection in the body; the bubonic plague is an infection of the lymphatic system, the pneumonic plague is an infection of the respiratory system, and the septicaemic plague is an infection in the blood stream.

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Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
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